questions about purple halos on my Sigma 85mm lens

Started 2 months ago | Discussions thread
EricTheAstroJunkie Contributing Member • Posts: 819
Re: questions about purple halos on my Sigma 85mm lens

Kazmarov wrote:

Hi. Not tracked as I was only testing the impact of aperture masking. ISO800, f/2.8 i.e. wide open on that lens and a single 1 sec exposure as it is a 180mm focal (I thought I could get away with it!).

It does seem to be good for me as it means I can use the lens for wide when I thought the expense had been wasted.

All credit for the idea to Rudy Pohl - do hope he is ok as he hasn't posted for a while either here or on his Flickr account.

@Rudy if you are "lurking": thanks. again!

Out of curiosity would you mind posting the full picture and what was the diameter of the aperture mask you used?

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